It was particularly useful when wanting to find my location on a map to determine how far I was from our camping location in the mountains. When I bought the Thommen I was really getting into backpacking with my sons and I always liked carrying my altimeter with me on our backpacking trips. Garmin GPS (Left), Thommen Altimeter (Center), Kestrel 4000 (Right) In fact, most altimeters I’ve seen also have inHg (inches of mercury), or mbar (millibar) markings for measuring barometric pressure. The barometric pressure change can be correlated to elevation change, therefore a barometer with a face showing feet or meters becomes an altimeter. If you’ve ever traveled from a low elevation to a higher elevation with something sealed, for example a bag of potato chips, you may have noticed that the bag expanded by quite a bit and sometimes looks like it is ready to burst! It does this because barometric pressure changes with elevation and the pressure decreases as elevation increases. The Thommen Classic Altimeter Plus Barometer is an aneroid type. One of the items I bought which I don’t use much anymore was a Thommen Classic altimeter. I thought it was the best outdoor store in town and was sorry to see it go, however, during the “going out of business” sales I bought a variety of equipment, at deeply discounted prices, which I still use today. Back in 2000 a small local outdoor store called Grand West Outfitters was going out of business.
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